Blow-torch



J. B. ANDERSONE AND C. H. ALLEN.

v BLOW TORCH. APPLICATION FILED 05c. 11. 1919.

1,364,972. Patented Jan. 11, 1921.

3 SHEETS-SHEET l.

l. B. ANDERSONE AND C. H. ALLEN.

BLOW TORCH.

APPLICATION FILED DEC. {1, 1919- I 1,364,972. Patented Jan. 11, 1921.

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mvzurons J. B. ANDERSONE AND C. H. ALLEN.

BLOW TORCH.

wmcmou FILED DEC. n. 1919.

1,364,972, Patented Jan. 11, 1921.

3 SHEETS-SHEET 3- INVENTOI.

UNITED STATES PATENT OFFICE.

JAMES B. ANDERSON AND CHARLES H. ALLEN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS TO P UMPLESS BLOW TORCH COMPANY. OF PITTSBURGH, PENNSYL- VANIA.

BLOW-TORCH.

Specification of Letters Patent.

Patented Jan. 11, 1921.

Application filed December 11, 1919. Serial No. 344,116.

To all whom it may concern:

Be it known that we, JAMES B. ANDER- SON and GiiARLns H. ALLEN, citizens of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Blow-Torches, of which the following is a specification.

This invention relates to blow-torches, and more particularly to a torch adapted for utilizing liquefied gas as fuel.

One of the main objects of the invention is to provide a torch so constructed as to enable the use of fuel in either gaseous or liquid form, as desired. A further object is to provide simple and efficient means for controlling and regulating the feed of the fuel. Another object is to provide simple and eiiicient means for cleaning the burner during use of the torch. Further objects will a pear from the detailed description.

In t e drawings a Figure 1 is a central vertical sectional view through a torch constructed in accord ance with our invention, parts being shown in elevation.

Fig. 2 is a fragmental sectional view through the standard and'associated parts.

Fig. 3 is a central vertical section through a modified form of tank.

Fig. 4; is a front view of the main burner and the pilot burner casing.

Fig. 5 is a section through the same.

Fig. 6 is a side view of a modified form of torch head.

Referring to Figs. 1 and 2, the tank 1 is provided with an opening through its top wall through which is secured, in any preferred or suitable manner a cylindrical standard 2' provided with two ducts 3 and 41: extending approximately one-third of the lengthof the standard. Theseducts communicate, at their upper ends, with a main duct '5 extending axially of the standard,

suitable valves 6 and 7 being provided for controlling communication between this main duct and the auxiliary ducts 3 and 4:, respectively;

A main burner 8 is secured in the standard and communicates with duct 5 at the upper end thereof, a pilot burner 9 being positioned below the main burner and also in communication with this duct. This pilot burner is inclosed by a casing 10 depending from a perforated mixer or manifold 11setom 24 centrally thereof.

cured to the standard and extending about the main burner 8 in the known manner. An opening is provided through the top of casing 10, a suitable screen 12 being insert ed in this opening, to permit lighting of the main burner from the pilot light of the pilot burner, as will be understood.

' The flow. of fuel from duct 5 to burner 8 is controlled by a valve 18 threaded through a nipple 15 projecting-from the standard and provided adjacent its outer end with a knurled wheel 16. This valve is of tubular construction to slidably receive a tubular member 17 open at its inner end and slidable through a packing gland 18 of suitable type provided at the outer end of the valve. A knurled disk 19 is detachably secured to the outer end of member 17 by means of a central stem 20 threaded into the outer end of the same. This stem is provided with an axial bore in which is secured" the outer end portion of a fine long cleaning wire or needle 21 the inner end of which is tapered to a fine point so as to readily enter the opening of burner 8, the needle being disposed substantially coaxial with this opening-as illustrated. Movement of member 17 in either direction is limited by a pin 22 secured in valve 13, the inner end of this pin projecting into a groove 23 in the outer face of member 17. By reciproing the flow of fuel to, and cleaning, the pilot valve 9.. I i

The bottom 24 of tanlrl is concaved'to accommodate the head of a plug 25 threaded into a valveca'sing 26 secured through bot- This casing is provided with a web 27 which is centrally apertured and ground to provide a seat for a ball valve'28 normally held seated by a coil spring 30 confined between the valve and a cap 31 threaded into the u per end of casing 26, this cap being proviiled with a central aperture 82 through its top. A

valve casing 33 is secured through the top of the tank and is provided with a bore 34 through its lower end, this bore communicating with a valve chamber 35 in WlllCll is mounted a ball valve 36 for normally closing the upper end of the bore. This valve is held seated by a coil spring 37 the upper end of which presses against a plug 38 threaded in the upper end of casing 33 and provided with an axial bore 39, this plug being secured in adjustment by a jam nut 40 so as to vary the pressure exerted by the spring on the valve to suit conditions.

In practice, the gas in liquid form is introduced into the tank through valve casing 26, plug 25 being removed for this purpose and replaced when the desired amount of liquefied gas has flowed into the tank. W hen the liquefied gas is placed in the tank, it will tend to vaporize, the gas vapor collecting in the upper portion of the tank and creating suflicient pressure, within a comparatively short time, to prevent further vaporizing of the gas the greater portion of which remains in the lower portion of the tank in its liquid state. A bent tube 41 is secured in the lower end of duct 4 of standard 2 and extends to within a short dis tance of the bottom of the tank adjacent the periphery thereof so as to be immersed in the liquefied gas. By opening valve 7, valve 6 being closed, the gas in liquid form may be supplied to either one or both of the burners, as desired, and by reversing this opera tion the gas in its gaseous form may be supplied to the burners. To permit ready flow of the fuel to the main burner 8 in the event that the valve for the pilot burner is closed, duct 5 is provided with an enlargement or chamber 5 forming a bypass about the valve body, and a similar chamber 5 is provided at the upper end of the duct to accommodate the nose or point portion of valve 13.

Tank 1 is provided with a suitable handle 42 the upper end of which is attached to the tank by a member 43. The lower end of the handle fits into a socket 44 carried by a tubular member 45 secured through the peripheral wall of the tank and provided with an axial duct 46 in its inner end portion. The outer end of this duct is normally closed by a valve 47 threaded into member 45 which is also provided with a radially extending duct 48 communicating with the space 49 about the point 50 of the valve. By opening the valve, the gas may be permitted to escape under pressure through duct 48. This provides means for readily determining if there is any gas in the tank, and also for determining if any of this gas is in liquid form so that the advisability or necessity of renewing the supply of gas can be ascertained.

In the modified form illustrated in Fig. 3, the tank is provided with a false bottom 24" which fits tightly about the upper end of valve casing 26, the space between the bottom 24 and false bottom 24 forming a gas chamber 51. A tube 52 has its lower end secured through false bottom 24, the lower portion of this tube being rovided with perforations 53. A thimb e 54 is threaded upon the lower end of the tube and is provided with a central opening ground to provide a seat for reception of the point of a needle valve 55 which extends through the tube and is slidable through a packing gland 56 secured on the upper end of the tube which also extends through the top of the tank. A tube 57 is secured in one of the auxiliary ducts of standard 2 and communicates at its lower end with chamber 51, and a tube 41 corresponding to tube 41 is secured in the other auxiliary duct. By opening valve 55 the gas in liquid form may be permitted to drip into chamber 51 where it quickly becomes gaseous. The gas thus produced may be fed to the burner, by means of tube 57, in the manner previously described. The liquefied gas or fuel may be supplied to the burners by means of tube 41, as will be understood.

In the form illustrated in Fig. 6, the head of the torch consisting of standard 2 and the burners, valves, and associated parts is carried by a suitable handle 58 the standard being connected by a flexible tube 55 to the tank, and liquid fuel sup ly tube 41 be ing replaced by a flexible tu e 41 In all other respects the operation of this head and the parts carried thereby is the same as that illustrated in Fig. 1 and previously described.

As suggested herein, there may be changes made in details of construction and arrangement of different. parts of the invention without departing from the field and scope of the same, and we intend to include all such variations, as fall within the scope of the appended claims, in this application in which a preferred form only of my invention is disclosed.

What we claim is:

1. In a torch of the character described, a tank, a standard provided with a main fuel duct and two auxiliary ducts communieating with said main duct, one of the auxiliary ducts being in communication with the tank adjacent the top'thereof and the other auxiliary duct being in communication with the tank adjacent the bottom thereof, a burner communicating with the main duct, and means for optionally closing the respective auxiliary. ducts.

2. In a torch of the character described, a tank, a standard secured through the to of the tank and provided with a main fue duct and with two auxiliary ducts extending from its lower end and communicating with the main duct, a burner communicating with the main duct, a tube extending from one or the auxiliary ducts to within a short distance of the bottom of the tank, and means for controlling communication between said '5 main duct and the respective auxiliary ducts.

3. In a torch of the character described, a tank, a standard secured through the top of the tank and provided with a main fuel duct and with two auxiliary ducts extending from its lower end and communicating with the main duct, a burner communicating with the main duct, a tube extending from one of the auxiliary ducts to within a short distance of the bottom of the tank, and means for controlling communication between said main duct and the respective auxiliary ducts, and means for determining the presence of fuel in the tank said means being located in the lower part of the handle stem.

4. In a torch of the character described, a tank, a standard secured through the top of the tank and provided with a main fuel duct and with two auxiliary ducts extending from its lower end and communicating with the main duct, a burner communicating with the main duct, a tube extending from one of the auxiliary ducts to within a short distance of the bottom of the tank, and means for controlling communication between said main duct and the respective auxiliary ducts, and means for determining the presence of fuel in the tank said means being located in the lower part of the handle stem, and a self closing filling means centrally located at the bottom of the tank.

5. In a torch of the character described, a tank, a. standard secured through the top of the tank and provided with a main fuel duct and with two auxiliary ducts extending from its lower end and communicating with the main duct, a burner communicating with the main duct, a tube extending from one of the auxiliary ducts to within a short distance of the bottom of the tank, and means for controlling communication between said main duct and the respective auxiliary ducts, and means for determining the presence of fuel in the tank said means being located in the lower part of the handle stem, and a self closing filling means located at the bottom of the tank.

In testimony whereof we affix our signatures.

JAMES B. ANDERSON. CHARLES H. ALLEN. 

